(6) sha1 for "src"; 0{40} if creation or unmerged.
(7) a space.
(8) sha1 for "dst"; 0{40} if creation, unmerged or "look at work tree".
(6) sha1 for "src"; 0{40} if creation or unmerged.
(7) a space.
(8) sha1 for "dst"; 0{40} if creation, unmerged or "look at work tree".